Alloy and its uses



7 PatentedAug. 14, 1928.

UNITED STATES" wnmnm roman nnnaran, or mrsrm nus-r3, ENGLAND.

ALLOY AND I'rs usns.

No Drawing. Application filed July 30, 1926, Serial No. 128,088, and in Great Britain August 5,1925.

Renewed February 16, 1838.

In the manufacture of jets or nozzles used for spinning artificial silk filaments or yarns or the like or where an alloy is ,required which is particularly hard or acid resisting or both, it is customary to use platinum or an alloy of platinum and iridium for these purposes. Where alloys of latinum and. gold have been used in inustry and more especially for the manufacture of the said jets, an alloy often per cent of platinum and ninety per. cent of gold has been employed. .1 now findthat superior results can be obtained by preparing an alloy consisting of a mixture of gold andplatinum in which the latter metal is present in the proportion of from seventeen to thirty-two per cent of the weight of the alloy produced. This-alloy can be prepared by melting the metals together at a temperature'which allows theresulting mixture to be transferred from the crucible without any material separation of the two metals prior to or at the time of pouring and any subsequent rolling or other treating of the same.

An'alloy of the abovementioned composition possesses unsuspected hardness. It also possesses entire freedom from the defeet exhibited by say gold alone-of flowing 0 under the action of a Bunsen flame which issufiicient to bring the metal to a bright redness and thus with the object of clearing away any organic matter resent on the same. This defect of flow w en present is sufficient. to close up the small holes present;

in the, jets. On the other hand this hardness of. metal does not interfere with drilling operations necessary to securethe said small holes. in the jets.

* foundf'also that the period during which the jets can be used before "they have to be dis carded is greatly extended; In practice it In practice it is is found that an alloy consisting of from twenty two to twenty six per cent of platinum is specially useful w en this metal is required for jets and the difiiculties caused by any separation of the two metals in the molten state before subsequent treatment are reduced. If required certain small additions of other metals (not exceeding five per cent) such as those of the platinum group can be added to this alloy. There is also the advantage in the use of this alloy in the saving of cost where the said metal is used in commerce or for other purposes where are ilsed. d my invention more especially' applicable to the manufacture of jets or nozzles. used for s inning artificial silk filaments or yarns, I 0 not limit 60 myself to this particular article as the alloy as herein set forth can be used for the manufacture of metal parts especially where acid resisting or heat resisting or special hardness or any of them is necessary. a

.I claim: I

1. An allo for use in the manufacture of jetsfor arti cialsilk filaments consisting of a mixture of gold andplatinum, the latter platinum or its usual allofi Although I have descri metal being present in the proportion of 7 from twenty .two to twenty Sid! per cent of the weight of the alloy produced.

2. An alloy for use in the manufacture of metal parts where acid resisting or heat" resisting or special hardness or any of them is essential consisting of a mixture of gold and platinumythe latter metal being present in the proportion of from. seventeen to twenty-six per cent of the weight of the alloy. produced.

In testimony whereof, I have signed my name to this specification at London this 16 day of Jul 1926.

WILLI PQRTERDREAPER. 

